Hehl served for many years as chairman of the management board. His influence as a technical specialist was decisive in shaping the business for more than six decades. Hehl was well-regarded, both on a human level and for his technical expertise. He was awarded the Order of Merit of the Federal Republic of Germany for his services. In 2007, the Society of Plastics Engineers (SPE) awarded and his brother Eugen Hehl the Business Management Award for their lifetime achievement.